/**
  ******************************************************************************
  * @file    COMP/COMP_Interrupt/Src/main.c
  * @author  MCD Application Team
  * @brief   This example provides a short description of how to use the COMP 
  *          peripheral Interrupt.
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; Copyright (c) 2017 STMicroelectronics.
  * All rights reserved.</center></h2>
  *
  * This software component is licensed by ST under BSD 3-Clause license,
  * the "License"; You may not use this file except in compliance with the
  * License. You may obtain a copy of the License at:
  *                        opensource.org/licenses/BSD-3-Clause
  *
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "main.h"

/** @addtogroup STM32L1xx_HAL_Examples
  * @{
  */

/** @addtogroup COMP_Interrupt
  * @{
  */

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
COMP_HandleTypeDef   Comp1Handle;

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void Error_Handler(void);
static void COMP_Config(void);

/* Private functions ---------------------------------------------------------*/

/**
  * @brief  Main program
  * @param  None
  * @retval None
  */
int main(void)
{
  /* STM32L1xx HAL library initialization:
       - Configure the Flash prefetch
       - Systick timer is configured by default as source of time base, but user 
         can eventually implement his proper time base source (a general purpose 
         timer for example or other time source), keeping in mind that Time base 
         duration should be kept 1ms since PPP_TIMEOUT_VALUEs are defined and 
         handled in milliseconds basis.
       - Set NVIC Group Priority to 4
       - Low Level Initialization
     */
  HAL_Init();

  /* Configure the system clock to 32 MHz */
  SystemClock_Config();

  /* Configure LED3 */
  BSP_LED_Init(LED3);
  
  /*## Configure peripherals #################################################*/
  /* Configure the COMP1 peripheral */
  COMP_Config();
  
  /*## Enable peripherals ####################################################*/
  /* Start COMP1 */
  if(HAL_COMP_Start_IT(&Comp1Handle) != HAL_OK)
  {
    /* Initialization Error */
    Error_Handler(); 
  }
  /* Infinite loop */
  while (1)
  {
  }
}

/**
  * @brief  COMP configuration
  * @param  None
  * @retval None
  */
static void COMP_Config(void)
{
  /*##-1- Configure the COMP1 peripheral ###################################*/
  Comp1Handle.Instance = COMP1;
  /* COMP1 Init: the higher threshold is fixed by hardware to VREFINT         */
  /* (~ 1.22V).                                                               */
  Comp1Handle.Instance                   = COMP1;

  Comp1Handle.Init.NonInvertingInput     = COMP_NONINVERTINGINPUT_PA1;
  Comp1Handle.Init.NonInvertingInputPull = COMP_NONINVERTINGINPUT_NOPULL;
  Comp1Handle.Init.TriggerMode           = COMP_TRIGGERMODE_IT_RISING_FALLING;
  if(HAL_COMP_Init(&Comp1Handle) != HAL_OK)
  {
    /* Initialization Error */
    Error_Handler();
  }
}

/**
  * @brief  Comparator interrupt callback.
  * @param  hcomp: COMP handle
  * @retval None
  */
void HAL_COMP_TriggerCallback(COMP_HandleTypeDef *hcomp)
{
  /* Toggle LED3 */
  BSP_LED_Toggle(LED3);
}

/**
  * @brief  System Clock Configuration
  *         The system Clock is configured as follow :
  *            System Clock source            = PLL (HSI)
  *            SYSCLK(Hz)                     = 32000000
  *            HCLK(Hz)                       = 32000000
  *            AHB Prescaler                  = 1
  *            APB1 Prescaler                 = 1
  *            APB2 Prescaler                 = 1
  *            HSI Frequency(Hz)              = 16000000
  *            PLLMUL                         = 6
  *            PLLDIV                         = 3
  *            Flash Latency(WS)              = 1
  * @retval None
  */
void SystemClock_Config(void)
{
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};

  /* Enable HSE Oscillator and Activate PLL with HSE as source */
  RCC_OscInitStruct.OscillatorType      = RCC_OSCILLATORTYPE_HSI;
  RCC_OscInitStruct.HSIState            = RCC_HSI_ON;
  RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
  RCC_OscInitStruct.PLL.PLLState        = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource       = RCC_PLLSOURCE_HSI;
  RCC_OscInitStruct.PLL.PLLMUL          = RCC_PLL_MUL6;
  RCC_OscInitStruct.PLL.PLLDIV          = RCC_PLL_DIV3;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    /* Initialization Error */
    while(1); 
  }

  /* Set Voltage scale1 as MCU will run at 32MHz */
  __HAL_RCC_PWR_CLK_ENABLE();
  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
  
  /* Poll VOSF bit of in PWR_CSR. Wait until it is reset to 0 */
  while (__HAL_PWR_GET_FLAG(PWR_FLAG_VOS) != RESET) {};

  /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2
  clocks dividers */
  RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK)
  {
    /* Initialization Error */
    while(1); 
  }
}

/**
  * @brief  This function is executed in case of error occurrence.
  * @param  None
  * @retval None
  */
static void Error_Handler(void)
{
  
  while (1)
  {
    /* Toggle LED3 */
    BSP_LED_Toggle(LED3);
      
    /* Add a delay */
    HAL_Delay(100);
  }
}

#ifdef  USE_FULL_ASSERT

/**
  * @brief  Reports the name of the source file and the source line number
  *         where the assert_param error has occurred.
  * @param  file: pointer to the source file name
  * @param  line: assert_param error line source number
  * @retval None
  */
void assert_failed(uint8_t *file, uint32_t line)
{
  /* User can add his own implementation to report the file name and line number,
     ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */

  /* Infinite loop */
  while (1)
  {
  }
}
#endif /* USE_FULL_ASSERT */

/**
  * @}
  */

/**
  * @}
  */

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
